An indwelling needle sustained release positive pressure apparatus comprising a protective cap (12), a threaded connector (1), a front catheter (2), a front three-way tee (3), a sustained release catheter (5), an intermediate catheter (4), a clamp (6), a rear three-way tee (7), a rear catheter (8), a three-way tee base (9), a positive pressure connector (11), and a solution reservoir (10). The clamp (6) is sleeved onto the intermediate catheter (4). The sustained release catheter (5) and the intermediate catheter (4) are connected at either extremity respectively to the two-hole extremity of the front three-way tee (3) and that of the rear three-way tee (7). The other components are connected with each other. The indwelling needle sustained release positive pressure apparatus is provided with two catheters, one of which is the sustained release catheter (5) provided at the middle thereof with a micropore, while the other is the intermediate catheter (4) having a universal aperture. When the intermediate catheter (4) is clamped shut by the clamp (6), hydraulic pressure released by the positive pressure connector (11) and the solution reservoir (10) forms a pressure, a medicinal solution slowly flows out from the micropore of the sustained release catheter (5) into an indwelling needle catheter component (13 and 15) and then permeates into a blood vessel, thus effectively preventing thrombus formation. In addition, when infusion is required on the next day, normal infusion can be allowed simply by disinfecting a connecting part before connecting and by opening the clamp on the intermediate catheter.Ce dispositif de pression positive à libération prolongée pour aiguille à demeure comprend un capuchon de protection (12), une tête hélicoïdale (1), un cathéter avant (2), trois canaux avant (3), un cathéter à libération prolongée (5), un cathéter central (4), une pince (6), trois canaux arrière (7), un cathéter arrière (8), une base à trois branches (9), une tête de connex
